TrigConfMuctpi: Fix compilation with boost 1.85.

Fix compilation with boost 1.85 (in lcg3): can't call get_child() on a temporary ptree.

This merge request affects 1 package:

• Trigger/TrigConfiguration/TrigConfMuctpi

This merge request affects 1 file:

• Trigger/TrigConfiguration/TrigConfMuctpi/src/MuctpiXMLHelper.cxx

Adding @cmorenom ,@oliveirg ,@orlando ,@paulama ,@stelzer ,@jmharris ,@tamartin ,@asonay as watchers

added Trigger main review-pending-level-1 labels

See ATR-29429

enabled an automatic merge when the pipeline for 9b7b649d succeeds

CI Result SUCCESS (hash 9b7b649d)

	Athena	DetCommon
externals
cmake
make
tests

Full details available on this CI monitor view. Check the JIRA CI status board for known problems
Athena: number of compilation errors 0, warnings 0
DetCommon: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-EL9 9910] (remote access info)

merged

mentioned in commit 3e5a023b

mentioned in merge request !75826 (merged)